Reducing mechanism for compressor and compressor

Abstract

The invention relates to the technical field of compressors, in particular to a speed reducing mechanism for a compressor and the compressor comprising the speed reducing mechanism for the compressor. The speed reducing mechanism for the compressor comprises an input shaft, a transmission assembly, an output shaft and an outer shell, the input shaft and the output shaft are in speed reducing transmission connection through the transmission assembly, the input shaft and the output shaft are both supported by the outer shell and are in running fit with the outer shell, and oil channels used for introducing lubricating oil are arranged between the input shaft and the outer shell and between the output shaft and the outer shell. When fluid lubricating oil is input into the oil duct, oil films can be formed between the input shaft and the outer shell and between the output shaft and the outer shell, so that the outer shell plays a role of a sliding bearing, the sliding bearing can reach an extremely high rotating speed under hydrodynamic lubrication of the lubricating oil, and the upper limit of the running rotating speed of the input shaft and the output shaft can be greatly improved; and the transmission efficiency of the speed reducing mechanism can be guaranteed, the bearing capacity is improved, and high-rotating-speed operation of the speed reducing mechanism is more stable.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a speed reduction mechanism for a compressor and a compressor comprising the speed reduction mechanism for a compressor. Background Art

[0002] The pump body of a conventional rolling rotor compressor is driven by a motor, and the two have the same speed. In order to make full use of the high efficiency of the motor at high speed and the high efficiency of the pump body at low speed, a reduction mechanism is added between the motor and the pump body. The input shaft and output shaft of the reduction mechanism are respectively connected to the power shaft on the motor side and the crankshaft on the pump body side. Through the reduction transmission from the input shaft to the output shaft of the reduction mechanism, the motor and the pump body can be operated asynchronously, thereby improving the efficiency of the compressor.

[0003] Conventional reduction mechanisms, such as planetary reducers, require bearings to support their input and output shafts to offset the radial and axial forces that may be encountered during operation. At the same time, most application areas of planetary reducers require transmission accuracy. Considering the high transmission accuracy of rolling bearings, the bearings currently used for the input and output shafts of planetary reducers are rolling bearings, including deep groove ball bearings and needle roller bearings. The outer ring of the rolling bearing is fixed with the reducer housing by interference fit, and the inner ring of the rolling bearing is fixed with the input and output shafts by interference fit, respectively. When such a reducer using rolling bearings is applied to a compressor, the following problems may occur during use: 1) Since the inner and outer bearing surfaces of the rolling bearings are in point contact, when the speed is too high, the rolling elements in the rolling bearings will be subjected to greater centrifugal force, which may lead to a decrease in load-bearing capacity and may generate additional noise and heat. Therefore, the rolling bearings are more suitable for medium and low speed operation, which limits the further increase of the input speed of the reducer, and also limits the increase of the motor speed of the compressor, making it difficult for the motor to operate in its optimal efficiency range; 2) Considering the operating stability of the reducer, the input shaft and output shaft of most planetary reducers on the market are supported by two rolling bearings respectively, which puts higher requirements on the assembly of the components of the entire compressor. Components such as retaining springs need to be used to limit the bearings, which further increases the number of components and may affect the transmission efficiency; 3) The running direction of the compressor is single during operation, so the compressor with a reducer does not have high requirements for transmission accuracy, but is more about meeting the requirements of high-speed operation of the compressor. Reducers with rolling bearings and high transmission accuracy are difficult to adapt to the requirements of high-speed operation of the compressor. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a reduction mechanism for a compressor, which can increase the operating speed, enhance the load-bearing capacity, and ensure the transmission efficiency, thereby meeting the high speed requirements of the compressor.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a reduction mechanism for a compressor, comprising an input shaft, a transmission assembly, an output shaft and an outer shell. The input shaft and the output shaft are connected by a reduction transmission through the transmission assembly. Both the input shaft and the output shaft are supported by the outer shell and rotatably cooperate with the outer shell. Oil passages for introducing lubricating oil are provided between the input shaft and the outer shell, and between the output shaft and the outer shell.

[0007] Preferably, an oil groove is provided on the inner surface of the outer housing that matches the input shaft and / or on the outer peripheral surface of the input shaft, and the oil groove forms an oil passage between the input shaft and the outer housing.

[0008] Preferably, an oil groove is provided on the inner surface of the outer shell that matches the output shaft and / or on the outer peripheral surface of the output shaft, and the oil groove forms an oil passage between the output shaft and the outer shell.

[0009] Preferably, the outer housing includes a first housing supporting the input shaft and a second housing supporting the output shaft, and the first housing is connected to the second housing.

[0010] Preferably, the first shell and the second shell are relatively connected to form an outer shell that is axially penetrated internally, and the internal through space of the outer shell is formed with a first inner hole, an intermediate cavity and a second inner hole that are sequentially connected, and the diameters of the first inner hole and the second inner hole are both smaller than the diameter of the intermediate cavity, and the first inner hole and the second inner hole are respectively provided for the input shaft and the output shaft to pass through, and the intermediate cavity accommodates the transmission assembly.

[0011] Preferably, a first journal extends from a side surface of the first shell away from the second shell, and the first inner hole passes through the first journal, and / or a second journal extends from a side surface of the second shell away from the first shell, and the second inner hole passes through the second journal.

[0012] Preferably, a connecting piece is provided on the outer shell, and the connecting piece is used to be connected with the internal components of the compressor.

[0013] Preferably, the transmission assembly includes a sun gear, a planetary gear, a planetary carrier and a ring gear arranged on the outer shell, one end of the sun gear is connected to the input shaft or is an integral part of an integral design, the other end of the sun gear is meshed with one side of the planetary gear, the other side of the planetary gear is meshed with the ring gear, one end of the planetary carrier is connected to the planetary gear, and the other end of the planetary carrier is connected to the output shaft or is an integral part of an integral design.

[0014] The present invention also provides a compressor, comprising the above-mentioned compressor speed reduction mechanism, wherein the input shaft is connected to the power shaft on the compressor motor side and rotates synchronously, and the output shaft is connected to the crankshaft on the compressor pump body side and rotates synchronously.

[0015] Preferably, a compressor housing is further included, and the outer housing is connected to the compressor housing via a connecting piece.

[0016] Compared with the prior art, the present invention has significant improvements:

[0017] The speed reduction mechanism for a compressor of the present invention can input fluid lubricating oil into the oil passages between the input shaft and the outer casing and between the output shaft and the outer casing, so that an oil film can be formed between the input shaft and the outer casing and between the output shaft and the outer casing due to the high-speed operation of the input shaft and the output shaft, thereby making the outer casing function as a sliding bearing. Compared with conventional reducers that use rolling bearings to support the input shaft and output shaft, the input shaft and output shaft of the compressor reduction mechanism of the present invention are supported by sliding bearings provided by the outer shell and lubricated by fluid lubricating oil. On the one hand, once the oil film is formed, the sliding bearing can reach an extremely high speed under the hydrodynamic lubrication of the lubricating oil fluid. At the same time, the flow of the lubricating oil will also take away the heat generated by the friction of the reduction mechanism, further ensuring high-speed operation, thereby greatly improving the upper limit of the operating speed of the input shaft and the output shaft, increasing the operating range of the reduction mechanism, and improving lubrication control, so that the reduction mechanism can be applied to fields with higher speeds, which can meet the high-speed operation requirements of the compressor; on the other hand, once the oil film is formed, the working friction coefficient of the sliding bearing will be very small, thereby ensuring the transmission efficiency of the reduction mechanism; further, the sliding bearing has a larger pressure-bearing area and a higher load-bearing capacity, and the load-bearing capacity will increase with the increase of the speed, thereby making the high-speed operation of the reduction mechanism more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic cross-sectional view of a speed reduction mechanism for a compressor according to an embodiment of the present invention.

[0019] Figure 2 It is a schematic structural diagram of a compressor speed reduction mechanism installed inside a compressor according to an embodiment of the present invention.

[0020] The reference numerals are described as follows:

[0021] 100 Reduction mechanism

[0022] 1 Input shaft

[0023] 2 Transmission components

[0024] 21 Sun gear

[0025] 22 Planetary gear

[0026] 23 Planetary bracket

[0027] 24 Ring gear

[0028] 3 Output shaft

[0029] 4 Outer shell

[0030] 401 First inner hole

[0031] 402 Intermediate cavity

[0032] 403 Second inner hole

[0033] 41 First Shell

[0034] 411 First journal

[0035] 42 Second Shell

[0036] 421 Second journal

[0037] 5 Connectors

[0038] 200 Motor

[0039] 201 Stator

[0040] 202 Rotor

[0041] 300 Power shaft

[0042] 400 Pump body

[0043] 500 Crankshaft

[0044] 600 compressor housing DETAILED DESCRIPTION

[0045] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0049] like Figure 1 and Figure 2 The figure shows an embodiment of the speed reduction mechanism for a compressor provided by the present invention.

[0050] See also Figure 1 The compressor speed reduction mechanism 100 of this embodiment includes an input shaft 1, a transmission assembly 2, an output shaft 3 and an outer shell 4. The input shaft 1 and the output shaft 3 are connected by a speed reduction transmission through the transmission assembly 2, so that the rotation speed of the output shaft 3 is less than the rotation speed of the input shaft 1. The input shaft 1 and the output shaft 3 are both supported by the outer shell 4 and rotated with the outer shell 4. Oil passages for introducing lubricating oil are provided between the input shaft 1 and the outer shell 4, and between the output shaft 3 and the outer shell 4. During operation, fluid lubricating oil is input into the oil passages, and an oil film can be formed between the input shaft 1 and the outer shell 4, and between the output shaft 3 and the outer shell 4 by the high-speed operation of the input shaft 1 and the output shaft 3, so that the outer shell 4 functions as a sliding bearing, and the outer shell 4 provides sliding bearings to support the input shaft 1 and the output shaft 3, replacing the rolling bearings supporting the input shaft and the output shaft in the conventional speed reducer.

[0051] Compared with the conventional reducer which uses rolling bearings to support the input shaft and the output shaft, the input shaft 1 and the output shaft 3 of the compressor reduction mechanism 100 of this embodiment are supported by sliding bearings provided by the outer shell 4, and are lubricated by fluid lubricating oil. On the one hand, once the oil film is formed, the sliding bearing can reach an extremely high speed under the hydrodynamic lubrication of the lubricating oil fluid. At the same time, the flow of the lubricating oil will also take away the heat generated by the friction of the reduction mechanism 100, further ensuring high-speed operation, thereby greatly improving the upper limit of the operating speed of the input shaft 1 and the output shaft 3, increasing the operating range of the reduction mechanism 100, and improving lubrication control, so that the reduction mechanism 100 can be applied to fields with higher speeds, and can meet the high-speed operation requirements of the compressor; on the other hand, once the oil film is formed, the working friction coefficient of the sliding bearing will be very small, thereby ensuring the transmission efficiency of the reduction mechanism 100; furthermore, the sliding bearing has a larger pressure-bearing area and a higher load-bearing capacity, and the load-bearing capacity will increase with the increase of the speed, thereby making the high-speed operation of the reduction mechanism 100 more stable.

[0052] In this embodiment, preferably, an oil groove is provided on the inner surface of the outer shell 4 that matches the input shaft 1 and / or on the outer peripheral surface of the input shaft 1, and the oil groove forms an oil passage between the input shaft 1 and the outer shell 4. That is, an oil groove may be provided on the inner surface of the outer shell 4 that matches the input shaft 1, and the oil passage between the input shaft 1 and the outer shell 4 is formed between the oil groove and the outer peripheral surface of the input shaft 1; or an oil groove is provided on the outer peripheral surface of the input shaft 1, and the oil passage between the input shaft 1 and the outer shell 4 is formed between the oil groove and the inner surface of the outer shell 4; or oil grooves are provided on both the inner surface of the outer shell 4 that matches the input shaft 1 and the outer peripheral surface of the input shaft 1, and the oil grooves are connected to form the oil passage between the input shaft 1 and the outer shell 4.

[0053] In this embodiment, preferably, an oil groove is provided on the inner surface of the outer shell 4 that matches the output shaft 3 and / or on the outer peripheral surface of the output shaft 3, and the oil groove constitutes the oil passage between the output shaft 3 and the outer shell 4. That is, an oil groove may be provided on the inner surface of the outer shell 4 that matches the output shaft 3, and the oil passage between the output shaft 3 and the outer shell 4 is formed between the oil groove and the outer peripheral surface of the output shaft 3; or an oil groove may be provided on the outer peripheral surface of the output shaft 3, and the oil passage between the output shaft 3 and the outer shell 4 is formed between the oil groove and the inner surface of the outer shell 4; or oil grooves may be provided on both the inner surface of the outer shell 4 that matches the output shaft 3 and the outer peripheral surface of the output shaft 3, and the oil grooves are connected to form the oil passage between the output shaft 3 and the outer shell 4.

[0054] Preferably, the outer housing 4 of the speed reduction mechanism 100 for the compressor of this embodiment includes a first housing 41 and a second housing 42. The first housing 41 supports the input shaft 1, and the input shaft 1 is rotatably matched with the first housing 41, and the second housing 42 supports the output shaft 3. The output shaft 3 is rotatably matched with the second housing 42. The first housing 41 and the second housing 42 are connected to form the outer housing 4. Therefore, the outer housing 4 adopts a split structure in which the first housing 41 and the second housing 42 are connected and combined, which can facilitate the assembly of the input shaft 1, the transmission assembly 2 and the output shaft 3.

[0055] Furthermore, the first housing 41 and the second housing 42 are connected relative to each other to form an outer housing 4 which is axially penetrated inside. The inner through space of the outer housing 4 is formed with a first inner hole 401, an intermediate cavity 402 and a second inner hole 403 which are sequentially connected. The diameters of the first inner hole 401 and the second inner hole 403 are both smaller than the diameter of the intermediate cavity 402. The first inner hole 401 is formed on the first housing 41. The first inner hole 401 is for the input shaft 1 to pass through and is rotatably matched with the input shaft 1. The inner wall surface of the first inner hole 401 is the inner surface of the outer housing 4 and the input shaft 1. The oil groove between the input shaft 1 and the outer housing 4 can be provided on the inner wall surface of the first inner hole 401. Thus, the first housing 41 can play the role of a sliding bearing support for the input shaft 1 through the first inner hole 401. The second inner hole 403 is formed on the second housing 42. The second inner hole 403 is for the output shaft 3 to pass through and rotate with the output shaft 3. The inner wall surface of the second inner hole 403 is the inner surface of the outer housing 4 that cooperates with the output shaft 3. The oil groove between the output shaft 3 and the outer housing 4 can be set on the inner wall surface of the second inner hole 403. Therefore, the second housing 42 can play the role of sliding bearing support for the output shaft 3 through the second inner hole 403. The intermediate cavity 402 is formed between the first housing 41 and the second housing 42. The intermediate cavity 402 accommodates the transmission assembly 2 connecting the input shaft 1 and the output shaft 3. The transmission assembly 2 can be connected and fixed to the intermediate cavity 402. Thus, the outer housing 4 structure of the reduction mechanism 100 is formed in which the sliding bearing of the input shaft 1, the frame of the transmission assembly 2, and the sliding bearing of the output shaft 3 are connected in sequence, and an oil pool space is formed inside the outer housing 4, which can be convenient for oil immersion and oil pumping.

[0056] In this embodiment, preferably, the first shell 41 and the second shell 42 are connected and fixed by bolts.

[0057] In this embodiment, preferably, a first journal 411 may be extended on the side surface of one end of the first housing 41 away from the second housing 42, and the first inner hole 401 passes through the first journal 411, so that the first journal 411 can also play a role of sliding bearing support for the input shaft 1. The axial length of the first inner hole 401 is increased by extending the first journal 411, thereby increasing the pressure bearing area of ​​the sliding bearing of the input shaft 1, improving the load-bearing capacity, and strengthening the support stability of the input shaft 1.

[0058] Preferably, a second journal 421 may be extended from the side surface of one end of the second housing 42 away from the first housing 41, and the second inner hole 403 passes through the second journal 421, so that the second journal 421 can also play a role of sliding bearing support for the output shaft 3. The axial length of the second inner hole 403 is increased by the extended second journal 421, thereby increasing the pressure bearing area of ​​the sliding bearing of the output shaft 3, improving the load-bearing capacity, and strengthening the support stability of the output shaft 3.

[0059] In this embodiment, preferably, a connector 5 is provided on the outer shell 4, and the connector 5 is used to connect with the internal components of the compressor so as to install and fix the compressor speed reduction mechanism 100 of this embodiment inside the compressor. Preferably, the connector 5 is provided on the outside of the middle cavity 402 of the outer shell 4. Preferably, see Figure 2 The connecting member 5 is connected to the compressor housing 600, so that the reduction mechanism 100 is installed and fixed inside the compressor housing 600, thereby realizing the installation and fixation of the reduction mechanism 100 inside the compressor.

[0060] See also Figure 1 Preferably, the transmission assembly 2 of the compressor speed reduction mechanism 100 of this embodiment includes a sun gear 21, a planetary gear 22, a planetary support 23 and a ring gear 24 provided on the outer shell 4. One end of the sun gear 21 is connected to the input shaft 1 or is an integral part of an integral design, so that the sun gear 21 and the input shaft 1 keep rotating synchronously. The way in which one end of the sun gear 21 is connected to the input shaft 1 is not limited, for example, it can be a flat key connection. The other end of the sun gear 21 is meshed with one side of the planetary gear 22, and the other side of the planetary gear 22 is meshed with the ring gear 24, and the ring gear 24 is provided in the middle cavity 402 of the outer shell 4 and is connected and fixed to the outer shell 4. One end of the planetary support 23 is connected and fixed to the planetary gear 22, so that the planetary support 23 and the planetary gear 22 keep rotating synchronously. The other end of the planetary support 23 is connected to the output shaft 3 or is an integral part of an integral design, so that the planetary support 23 and the output shaft 3 keep rotating synchronously. The way in which the other end of the planetary support 23 is connected to the output shaft 3 is not limited, for example, it can be a flat key connection. When the input shaft 1 receives the rotational torque and rotates, the sun gear 21 rotates accordingly, and drives the planetary gears 22, the planetary carrier 23 and the output shaft 3 to rotate. The sun gear 21 and the planetary gear 22 have gear teeth of different sizes, which can realize variable speed transmission, so that the output shaft 3 and the input shaft 1 run asynchronously at different speeds, and the speed of the output shaft 3 is less than the speed of the input shaft 1, realizing reduction transmission.

[0061] Based on the compressor speed reduction mechanism of the present invention, the embodiment of the present invention further provides a compressor. The compressor of this embodiment includes the compressor speed reduction mechanism 100 of this embodiment. Figure 2The input shaft 1 of the speed reduction mechanism 100 is connected to the power shaft 300 on the compressor motor 200 side and rotates synchronously, and is used to receive the rotational torque from the power shaft 300. The output shaft 3 is connected to the crankshaft 500 on the compressor pump body 400 side and rotates synchronously, and is used to output torque to the crankshaft 500 to drive the crankshaft 500 to operate. Through the speed reduction transmission of the transmission assembly 2 between the input shaft 1 and the output shaft 3 of the speed reduction mechanism 100, the rotation speed of the crankshaft 500 on the compressor pump body 400 side is lower than the rotation speed of the power shaft 300 on the motor 200 side, thereby realizing the asynchronous operation of the motor 200 and the pump body 400, and making full use of the characteristics that the motor 200 is more efficient at high speed and the pump body 400 is more efficient at low speed, so that the motor 200 and the pump body 400 can work in their respective optimal efficiency ranges at the same time, thereby greatly improving the efficiency of the compressor as a whole. At the same time, since the above-mentioned speed reduction mechanism 100 for the compressor in this embodiment can increase the operating speed, enhance the load-bearing capacity, and ensure the transmission efficiency, it can meet the high-speed operation requirements of the compressor in this embodiment.

[0062] Preferably, see Figure 2 The compressor of this embodiment further includes a compressor housing 600, which is a hollow structure. The motor 200, the power shaft 300, the speed reduction mechanism 100, the pump body 400 and the crankshaft 500 are all accommodated inside the compressor housing 600. The motor 200 includes a stator 201 and a rotor 202. The stator 201 is connected and fixed to the compressor housing 600 so that the motor 200 is fixedly installed in the compressor housing 600. The rotor 202 is arranged inside the stator 201. The power shaft 300 is passed through the rotor 202 and connected and fixed to the rotor 202, so that the motor 200 and the rotor 202 drive the power shaft 300 to rotate synchronously. The pump body 400 is connected and fixed to the compressor housing 600 through a pump shell (such as a cylinder head) so that the pump body 400 is fixedly installed in the compressor housing 600. The pump body 400 is the compression structure of the compressor, and the crankshaft 500 is inserted into the pump body 400. The eccentric portion of the crankshaft 500 carries the piston to perform eccentric operation inside the pump body 400 to compress the working medium entering the pump body 400. The speed reduction mechanism 100 connects the power shaft 300 and the crankshaft 500 between the motor 200 and the pump body 400 to achieve speed reduction operation. The outer shell 4 of the speed reduction mechanism 100 is connected to the compressor housing 600 through the connector 5, so that the speed reduction mechanism 100 is installed and fixed inside the compressor housing 600, and the speed reduction mechanism 100 is installed and fixed inside the compressor.

[0063] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A speed reduction mechanism for a compressor, characterized in that: The invention comprises an input shaft (1), a transmission assembly (2), an output shaft (3) and an outer shell (4); the input shaft (1) and the output shaft (3) are connected by a reduction transmission via the transmission assembly (2); the input shaft (1) and the output shaft (3) are both supported by the outer shell (4) and are rotatably matched with the outer shell (4); and oil passages for introducing lubricating oil are provided between the input shaft (1) and the outer shell (4) and between the output shaft (3) and the outer shell (4).

2. The speed reduction mechanism for a compressor according to claim 1, characterized in that: An oil groove is provided on the inner surface of the outer shell (4) matching the input shaft (1) and / or on the outer peripheral surface of the input shaft (1), and the oil groove constitutes the oil passage between the input shaft (1) and the outer shell (4).

3. The speed reduction mechanism for a compressor according to claim 1, characterized in that: An oil groove is provided on the inner surface of the outer shell (4) matching the output shaft (3) and / or on the outer peripheral surface of the output shaft (3), and the oil groove constitutes the oil passage between the output shaft (3) and the outer shell (4).

4. The speed reduction mechanism for a compressor according to claim 1, characterized in that: The outer shell (4) comprises a first shell (41) supporting the input shaft (1) and a second shell (42) supporting the output shaft (3), and the first shell (41) is connected to the second shell (42).

5. The speed reduction mechanism for a compressor according to claim 4, characterized in that: The first shell (41) and the second shell (42) are connected relative to each other to form the outer shell (4) which is axially penetrated inside. The inner through space of the outer shell (4) is formed with a first inner hole (401), an intermediate cavity (402) and a second inner hole (403) which are sequentially connected. The diameters of the first inner hole (401) and the second inner hole (403) are both smaller than the diameter of the intermediate cavity (402). The first inner hole (401) and the second inner hole (403) are respectively provided for the input shaft (1) and the output shaft (3) to pass through. The intermediate cavity (402) accommodates the transmission assembly (2).

6. The speed reduction mechanism for a compressor according to claim 5, characterized in that: A first journal (411) extends from a side surface of one end of the first shell (41) away from the second shell (42), and the first inner hole (401) passes through the first journal (411); and / or a second journal (421) extends from a side surface of one end of the second shell (42) away from the first shell (41), and the second inner hole (403) passes through the second journal (421).

7. The speed reduction mechanism for a compressor according to claim 1, characterized in that: The outer shell (4) is provided with a connecting piece (5), and the connecting piece (5) is used to be connected to the internal components of the compressor.

8. The speed reduction mechanism for a compressor according to claim 1, characterized in that: The transmission assembly (2) comprises a sun gear (21), planetary gears (22), a planetary carrier (23) and a gear ring (24) arranged on the outer shell (4); one end of the sun gear (21) is connected to the input shaft (1) or is an integral part of an integral design; the other end of the sun gear (21) is meshed with one side of the planetary gear (22); the other side of the planetary gear (22) is meshed with the gear ring (24); one end of the planetary carrier (23) is connected to the planetary gear (22); the other end of the planetary carrier (23) is connected to the output shaft (3) or is an integral part of an integral design.

9. A compressor, characterized in that: It comprises a reduction mechanism for a compressor as claimed in any one of claims 1 to 8, wherein the input shaft (1) is connected to the power shaft (300) on the compressor motor (200) side and rotates synchronously, and the output shaft (3) is connected to the crankshaft (500) on the compressor pump body (400) side and rotates synchronously.

10. The compressor according to claim 9, characterized in that It also comprises a compressor housing (600), and the outer housing (4) is connected to the compressor housing (600) via a connecting piece (5).

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